Lathe.



NITED f STATES;4

PATENT Prion.

RICHARD M. NUTTALL, or PITTsRURG, PENNSYLVANIA.

LATHE.

sPncInIcATIoN foi-ming part of netten' 'Patent No. 655,956,riatea'Aig-iist 14, 1900.

Application inea Apiii 4, 1900,

To au. whom, it may concern:

Be it known that I, RICHARD M. NU'rrALL, a resident of Pittsburg, inthecounty of Allegheny and State of Pennsylvania, have invented a newandusetul Improvement in Lathe-Stars; and I do hereby declare thefollowing to be a full, clear, and exact description thereof.

My invention relates to lathe-stars for chasing threads on taps andother articles; and it has for its object to provide a cheap and simpledevice for this purpose which can be applied to any form of lathe, aswell as one which can be seen conveniently at all times by the mechanic,and one which can be shifted out of engagement when not in use andlocked in its different positions.

My invention consists, generally stated, inx the novel arrangement,construction, and combination of parts, as hereinaftermore' specificallyset forth and described, and particularly pointed out in the claims.

To enable others skilled in the art to which my invention appertains toconstruct and use the lathe-star, I will describe the same more fully,referring to the accompanying sheet of drawings, in which- Figure 1 is aside view of a portion of a lathe, showing my improved star appliedthereto. Fig. 2 is an enlarged cross-section of such lathe, showing thestar in engagementY therewith. 'Fig 3 is an enlarged face view of thestar. Fig. 4 is an enlarged'top View of the same. Fig. 5 is across-section of the same on the line 5 5, Fig. 3. Fig. 6 isallongitudinal section of the same removed,:and Fig. 7 is a sectionalview showing another manner of applying the s tar tothe lathe-table.

Like characters herein indicate like parts in each of the figures of thedrawings.

1 represents the lathe ofthe ordinary approved construction, .whichvisprovided with the body portion or frame' 2 for supporting theoperativepartsof the lathe and on which is journaled the feeding-screwbar 3. A table 4 for carrying the tools travels along said frame 2 andis connected to the chasing and feeding screw'bar 3 by a `split nut 5,which also acts to feed .the table 4 and is connected to and operatedyb'y a handle 6, journaled in' said table 4, and a pinion 7 is journaledin the table,havinga handleS connected thereto,

serial No. 11,512. (Nimah.)

which `is adapted to engage with a rack 8 on the'body portion 2 of the.lathe 1 for shifting the table 4 when necessary. The star 9 is removablysecured to the end 4 of the table 4 and consists of a head '10, which isheld against the end 4 by means of screw-bolts 11, -which are providedwith heads 11' thereon, and pass through slotted holes 10, formed in thehead 10 and into the end 4 of the table. The head 10 is also providedwith a tubular extension 12, which extends down below the same andwithin which a shaft or spindle 13 is mounted for carrying a gear wheelor pinion 14, which is adapted to mesh with the feeding-screw bar 3, anda collar 15 is formed :on said pinion 14, within which a screw or pin 15is adapted to pass and fit 'within a slot lor `groove 13', formed inthe'spindle 13 for ad- 'justing said pinion 14 and holding it in place."A Ycollar 16 is formed on the spindle 13, which iits on the top of aplunger-ring 17, which iits loosely around the spindle 13 and within anIopening or seat 10, formed in the head l0. iA disk 1S, having adial-face 13 thereon, is Q mounted around the spindle 1,3 above the col-'lar .16 and is adapted to extend over the top 4 of the table 4, while athumb-nut 19 is 'adapted to engage with the threaded end 19 1on thespindle 13 and with the disk 18 for jholding the latter in place.

A linger or pointer 2O extends over the dial-face 18 of the disk 18 andis secured to one end of the head 10 by means of screw-bolts 21, while ahandle 20' is secured to the disk 18 for moving or revolving the samewhen desired. A thumb-screw 22 enga, es with a threaded portion 22 ofthe opening or seat 10 in the-head 10 and is adapted to cornein'rcontact with the plunger-ring 17 within such seat'10.

The use and operation of my improved lathestar are as follows:' The star9 being secured in .place upon the end 4; of the lathe-table 4, as shownin Figs. 1 and 2, and it is desired to use the same in the chasing ofthreads on a tap or other article or object .placed on the lathe 1, allthat is necessary is for the operator to loosen or unscrew thethumb-screw'22 in the seat 10 of the head '10 and move over the star 9toward the lathe 1, so causing the pinion 14 on the spindle 13 to comeinto contact and mesh with the feeding-screw bar 3 on the lathe 1, afterwhich the thumb-screw IOO 22 can be tightened up against the plungerring17 within the seat 10 of the head to press said ring 17 against the endt of the table 4f, and so hold the star 9 in position for operation. Asthe screw-bar 3 on the lathe 1 is constantly revolving in the samedirection when power is applied to the lathe, and as the table 4,carrying the tool, travels to the left of said lathe 1 by means of thenut 5 engaging with said screw-bar the pinion.14C on the spindle 13 ofthe star 9 and meshing with the bar 3 travels along with said table 1,and as soon as the table Lthas traveled a suiiicient distance to chasethe threads on the tap or other article by means of the tool on saidtable the operator releases the nut 5 from engagement with the screw-bar3 by means of the `handle G. After this is accomplished the operatorgrasps the handle 8' and turns the saine to the right, which revolvesthe pinion 7 connected therewith and engages with the rack 8 on thelathe 1 to shift the table 4 to the rightl for another operation inchasing, and as the table 4 is thus` shifted the pinion 1-1 on thespindle 13 will still be in mesh with the revolving screw-bar 3, so thatthe movements of the spindle 13, pinion 14, and disk 1S, with partsconnected thereto,will be reversed within the head 10. \Vhen the tab1e4and star 9 thereon have reached the required position at the right ofthe lathe 1 and it is desired to chase threads on another tap orarticle, all

f that is necessary is to grasp the handle 6 and turn the same so thatthe nut 5 engages the screw-bar 3, when the particular point on the dial1S of the disk 1S is revolved bythe spindle 13 and reaches the finger orpointer 20, so enabling the tool on the table 4 to start to chase thethreads on the tap or other article when desired. rPhe disk 18, with itsdial 18 thereon, being thus revolved by the spindle 13, can be turned bythe handle 20 thereon and set by the thumb-nut 19 on the threaded end 19of the spindle 13, so that the particular point on said dial 13 isindicated by the finger or pointer 2O in the making or chasing ofdifferent kinds of threads-as, for instance, in making even threads thenut 5 can engage the bar 3 when any one of the eight points on the dialreaches the pointer20, in chasing add threads when any 011e of the fourpoints reaches the pointer 20, in chasing one-half threads when any oneof two opposite points reaches the pointer 20, and in chasingthreequarter threads when the disk 1S has been revolved three-fourths ofthe distance from one of the points so set and this point reaches thepointer 20.

lVhenit is desired to use the lathe 1 for other purpose than that ofchasing threads, the star 19 can be removed from engagement with thescrew-bar 3 by unscrewing the thumb-screw 22 within the opening or seat10 in the head 10, so as to free the plunger-ring 17 from contact withthe end i of the table 4, when the operator can grasp the star 9 andpull the same outward, so freeing the pinion 14.- on the spindle 13 fromengagement with the screwbar 3 and permitting the head 10, carrying theoperative parts of the star 9, to move outward on the bolts 11 throughthe medium of the slotted holes 10 in said head 10. After the star 9 hasbeen thus moved outward and the pinion 11 is free from contact with thebar 3 the thumb-screw 22 can be tightened up within the opening 10', soas to press the plunger-ring 17, surrounding the spindle 13, against theend -1 of the table 4 and so lock the star 9 in such outward position,when the lathe can be used for any other purpose desired.

In Fig. 7 there is shown another manner of attaching the star to thetable, and it consists in forming a T-shaped slot 23 in the table,within which the head 2t of a screw-bolt 2t is adapted to fit and aroundwhich the head of the star is removably secured by means of a thumb-nut25, engaging with said bolt 2t, and a hole or opening 26 is formedthrough the head, which is adapted to coincide with a hole or opening26', formed through the bolt 24, within which holes or openings 26 and26 the spindle carrying the operative parts of the star is adapted to beseated and carried thereby. It will be evident that by the screwing` orunscrewing of the thumb-nut 25 and the moving of the bolt 24 within theslot 23 of the table the star carried by such bolt 24 can be set inengagement with the screw-bar of the lathe and locked in such positionor shifted out of engagement with the screwbar and locked in suchposition or removed entirely from the table, if desired, and so do awaywith the slotted holes in the head and screw bolts fitting therein, aswell as the plunger-ring surrounding the spindle of the star.

In some forms of lathes it maybe desirable to use a feeding-screw forthe table separate from the chasing-screw bar, and in this case thefeeding-nut of the table can engage with the feeding-screw bar and thepinion of the star engage with the chasing-screw bar.

Various other modifications in the construction and design of theVarious parts of the device may be resorted to without departing fromthe spirit of the invention or sacrificing any of its advantages. V

Vtlhat I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination with a lathe having a table thereon adapted to engagewith a revolving screw-bar, of a thread-indicator having a shaft orspindle, a pinion on said shaft or spindle adapted to engage with saidscrewbar, and means ou said shaft or spindle for shifting the indicatorin and out of engagement with the screw-bar.

2. The combination with a lathe having a table thereon adapted toenga-ge with a revolving screwbar, of a thread -indicator adapted toengage with said screw-bar, means on said indicator for shifting thesame in and out of engagement with the screw-bar, and

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means for locking said indicator in its inward and outward positions.

3. The combination with a lathe having a table thereon adapted to engagewith a revolving screw-bar, of a head secured on said table, a shaft orspindle mounted Within said head and carrying a dial thereon, a pinionon said shaft or spindle adapted to mesh with the screw-bar, and meansonv said head for permitting the shifting of the said pinion in and outof engagementV with the screw-bar.

4. The combination with a lathe having a table thereon adapted to engagewith a revolving screw-bar, of a head screwed on said table, a spindlemounted within said head and carrying a dial thereon, a pinion on saidspindle adapted to mesh with the screw-bar, and bolts secured in saidtable adapted to pass through slots in said head for permitting theshifting of the said pinion in and out of engagement with the screw-bar.

5. The combination with a lathe having a table thereon adapted to engagewith a revolving screw-bar, of a head secured on said table, a spindlemounted in said head and carrying a dial thereon, a pinion on saidspindie adapted to mesh with the screw-bar, means on said head forpermitting the shifting of the said pinion in and out of engagement withthe said screw-bar, and means connected to said head and spindle forlocking the same in their inward and outward positions.

6. The combination with a lathe having a table thereon adapted to engagewith a revolving screw-bar, of a head secured on said table, a spindlemounted in said head and carrying a dial thereon, a pinion onsaidspindie adapted to mesh with the screw-bar, means on said head forpermitting the shifting of the said pinion in and out of engagement withthe said screw-bar, a plunger-ring within said head surrounding thespindle, and a thumb-nut fitting within an opening in said head andadapted to press the plunger-ring against said table for locking saidhead and spindle in its inward and outward positions.

7; The combination with a lathe having a table thereon adapted to engagewith a revolving screw-bar, of a head secured on said table, a spindlemounted within said head and carrying a dial thereon, a pinion on saidspindle adapted to mesh with the screw-bar, means on said head forpermitting the shifting and locking of said pinion in and out ofengagement with the screw-bar, and means for raising and lowering saidpinion on said spindie.

8. The combination with a lathe having a table thereon adapted to engagewith a revolving screw-bar, of a head secured on said table, a spindlemounted within said head and carrying adial thereon, a pinion on saidspindle adapted to mesh with the said screwbar, means on said head forpermitting the shifting and locking of said pinion in and out ofengagement with said screw-bar, and a set-screw on said pinion adaptedto engage with a groove in said spindle for permitting the raisingandlowering of said pinion.

9'. The combination with a lathe having a table thereon adapted toengage with a revolving screw-bar, of a thread-indicator having a dialthereon adapted to engage with said screw-bar, means on said indicatorfor permitting the shifting and locking of the same in and ont ofengagement with said screw-bar, and means for setting or locking saiddial at any desired point.

10. The combination with a lathe having a table thereon adapted toengage with a revolving screw-bar, of a head secured on said table, aspindle mounted within said head and carrying a dial loosely mountedaround the same, a pinion on said spindle adapted to mesh with thescrew-bar, means on said head for permitting the shifting and locking ofsaid pinion in and out of engagement with said screw-bar, and athumb-nut adapted to engage with the said spindle and dial to lock thelattr at any desired point.

ll. The combination With a lathe having a table thereon adapted toengage with a revol-ving screw-bar, ot' a head secured on said table, aspindle mounted within said head and carrying a dial loosely mountedaround the same, a pinion on said spindle adapted to mesh with saidscrew-bar, means on said head for permitting the shifting and locking ofsaid pinion in and out of engagement with said screw-bar, a thumb-nutadapted to engage with said spindle and dial to lock the -latter at anydesired point, a handle on said dial, and a pointer extending over saiddial and secured to said head.

In testimony whereof l', the said RICHARD M. NUTTALL, have hereunto setmy hand.e

RICHARD M. NUTTALL. Witnesses:

J. N. COOKE, J AMESV L. WEHN.

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